Sheet-metal pulley.



PATENTED MAR. 21, 1905.

G. O. GARDNER.

SHEET METAL PULLEY.

APPLICATION FILED AUG. 12,1904.

GEoRGE o. GARDNER,

fiatnted'lvfarch 21, 1905.

PATENT OFFICE.

OF, cHIcA o, ILLINOIS.

SHEET-METAL PULLEY. 1

SPECIFICATION forming part of Letters Patent No. 785,256, dated March 21, 1905.

Application filed August 12, 1904. Serial No. 220,451.

To all whom it may concern:

Be it known that I, GEORGE C. GARDN R, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sheet-Metal Pulleys, of. which the following is a specification.

My invention relates to certain improvements in sheet-metal pulleys, the purpose of which is to produce a cheap, strong, and durable pulley having suflicient lateral extent at its central portion to afford a good bearingsurface for a pin or axle.

To such end my invention consists in certain structural improvements which will appear from the description in detail which follows and the characteristic features of which will be pointed out in the appended claims.

The invention is illustrated in the drawings by means of a face view of one side ofthe pulley, which appears in Figure 1, and a diametrical transverse section, which appears in Fig. 2.

Referring to the drawings, A A are two plates having their outer margins stamped laterally from the plane of the central portion and placed together with these outwardlystamped margins upon opposite sides. Both of the plates are perforated at a (the perforations being here shown as six in number) and arranged in a circle about the center of the pulley with their greatest length in the circumference of the circle. The central portions of the plates are stamped laterally, as seen in Fig. 2 at a, to form flanges extending upon the same side of each plate as the has three ro'ectin ton ues 6 shown as e ui-,v

distant uponthe periphery thereof, and the perforations in the middle plates are also shown as equidistant and six in number. The tongues on the hub-plates are turned inward, passed through the alternate perforations of the middle plates, and clenched upon the opposite side of the middle plates, preferably against the edge of the opposite hubplate. This gives to the pulley a neat and substantial appearance. Each hub-plate has three tongues, by means of which it is held against one of the middle plates, and six tongues, by means of which its center is held in line with that of the other plates. This results from the fact that the three tongues upon the opposite hubplate are clenched against the edge of the first and prevent any slipping of the latter upon the adjacent middle plate.

It should be noticed that the flat sides of the tongues are presented to the edges of the openings in a circle about the central bearing of the pulley, strengthening the latter against strains tending to shift the central openings in the different plates out of line. The three flanges stamped from the perforations in the central portions of the various plates form a central bearing for the pulleys of considerable lateral extent and present the smooth side surface of the sheet metal to the pin or other axle placed within the pulley.

While the specific construction which has been described in detail is thought to be preferable, it is recognized that more or less variation is possible, and hence that the invention is not limited, as to its broader features, to the exact form and arrangement of the parts as illustrated.

I claim as new and desire to secure by Letters Patent- 1. A sheet-metal pulley formed of two main middle plates and two hub-plates upon the opposite sides thereof, all of said plates being secured together, the central portions of the middle plates being stamped outward in the form of; annular flanges and the central portions of the hub-plates being stamped inward in the form of annular flanges corresponding thereto, said four flanges being arranged in line to form the walls of the central perforation of the pulley, substantially as described.

2. The combination with two middle plates having central annular flanges stamped outwardly therefrom, of two hub-plates having central annular flanges stamped inwardly therefrom and arranged in line with those of the middle plates, the outer portions of said hub-plates being brought inward and secured to the middle plates.

3. The combination with two middle plates,

of two hub-plates upon opposite sides thereof,

all having central bearing-surfaces arranged in line, said middle plates being perforated around the margins of the hub-plates, and said hub-plates having tongues extending through 10 these perforations and clenched upon the opthe county of Cook and State of Illinois, this 15 1st day of August, A. D. 1904. 4

GEORGE (J. GARDNER. Witnesses:

C. S. MAGNER, M. E. BROWN. 

